In this paper we review recent progress in obtaining laser action from semiconductor
quantum cascade structures covering the low THz region of the electromagnetic spectrum …

We present a detailed experimental and theoretical study of a GaAs∕ AlGaAs mid-infrared
quantum cascade laser (QCL) under a strong magnetic field. The emitted power and the …

A terahertz quantum cascade laser, operating at λ= 159 μ m and exploiting the in-plane
confinement arising from perpendicular magnetic field, is used to investigate the physics of …

In this article we review the physical characteristics of quantum cascade transitions (QCTs)
in various nanoscopic systems. The quantum cascade laser which utilizes such transitions in …

The dependence of the scattering rate between different electronic states in semiconductor
heterostructures due to interface roughness on the barrier height is exploited to enhance the …

A density matrix theory of electron transport and optical gain in quantum cascade lasers in
an external magnetic field is formulated. Starting from a general quantum kinetic treatment …

We have theoretically explored the influence of the magnetic field on supporting the
multimode Risken-Nummendal-Graham-Haken (RNGH) self-pulsations seen in the optical …

We present a model for calculating the optical gain in a midinfrared Ga As∕ Al Ga As
quantum cascade laser in a magnetic field, based on solving the set of rate equations that …

The scattering of electrons out of the upper laser state into indirect valleys in quantum-
cascade lasers is demonstrated by investigating the operation of the laser under the …

A theoretical model of electron transport in quantum cascade lasers subjected to a magnetic
field is developed. The Landau level electronic structure was calculated from the envelope …